Lathe.



. PATENTED AUG. 4, 1903. J. c. POTTER & J.JO'HN'STON.

- LATHE.

APPLICATION EILBD JAN. 7, 1901.

3 SHEETS-SHEET N0 MODEL.

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- No-'- .7-35,583. PATENTED AUG. 4, 1903.

J. 0. POTTER & J. JOHNSTON.

LATHE.

APPLIOATION FILED JAN. 7, 1901.

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m WW? I UNITED STATES i zahtd August 4, 190:1;

PATENT OFFICE.

JAMES C. POTTER AND JOHN JOHNSTON, OF PAWTUCKET, RHODE ISLAND,

ASSIGNORS TO POTTER AND JOHNSTON MACHINE COMPANY, OF PAW- TUCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

LATH E.

SPECIFICATION forming part of LettersPatent No. 735,583, dated August 4, 1903. Application filed lanuary 7, 1901. Serial No. 42,364. (No model.)

To all whom it may concern.-

Be it known that we, JAMES C. POTTER, a citizen of the United States, and J QHN-J OHN S- TON, a subject of the King of Great Britain, both residing at Pawtucket, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Lathes, of which the following is a specifica tion.

This invention has reference to the class of lathes in which the work is supported and rotated by the head-stock spindle and the' tools are supported on a tool-slide which carries the tools forward and backward to oper- I 5 ate on the work.

The invention consists in the peculiar and novel construction and combination whereby the tool slide is operated by a lever, the throw of which may be adjusted and the travel of the tool-slide varied, as will be more fully set forth hereinafter and more particularly pointed out in the claims.

In a lathe of the nature described the length of the travel of the tool-slide requires 2 5 to be changed as the nature of the'operations of the tools may require. To secure the best results, the speed of the feed of the several tools should also be varied.

The object of this invention is to so construct the tool-slide-operating mechanism that the length of travel of the tool-slide may be accurately and conveniently adjusted.

Figure 1 is a longitudinal sectional View of the tool-slide end of a lathe, showing the le- 3 5 ver for operating the tool-slide and the operating mechanism. Fig. 2 is atransverse sectional view, on an enlarged scale, of the toolslide end of the lathe showing the mechanism for adjusting the throw of the lever 0 and the length of the travel of the tool-slide.

Fig. 3 is a horizontal sectional view of the adjusting mechanism. showing the rack-and-pinion connection of the adjusting mechanism. I

Similar letters of reference indicatecorresponding parts in all the figures.

In the drawings, A indicates the frame or standard on which the operative parts of the lathe are supported. The frame A is pref- Fig. 4 is a detail view' erably formed with inclined and closed sides and ends to inclose and protect the operative mechanism, suitable doors being provided to give the required access to the interior of the frame. The tool-supporting slide B is supported on ways formed on the upper part of the frame A. A turret C is usually used on this class of lathes,rotatably supported on the tool-slide B and adapted to present a series of tools successively to the work.

In the rear end of the tool-slide B the longitudinal slot 1) and below this the ways 12 are formed to lit the bracket 17. The clamping-bolt 19 extends through the slot 1) and serves to clamp the bracket b to the toolslide. The screw-spindle b is journaled in the tool-slide and provided with a wrenchhead at one end. The screw-spindle b extends through and is in screw-thread engagement with the bracket 1). The link 11 is pivotally connected with the preferably slotted bracket 1), as is shown in Fig. '2. The other end of the link If is pivotally connected with the upper end of the lever D, the lower end of which is supported on the rock-shaft d, journaled in the sleeves d d, secured in 1 the lower part of frame A. The lever D has the ways (1 d extending lengthwise, in which the slide (Z inclosing the wrist-pin 61 may slide. The wrist-pin d is secured to the carriage d supported in the ways (1 secured to or forming part of the gear 61 which is provided with the trunnion d journaled in the bearing 61 secured to the frame A.

The carriage d has the groove c2 of T- shaped cross-section, in which the head end of the bolt d is inserted. The rack-bar d is secured to the carriage'and engages with the pinion 01 on the sleeve 61 which extends through the axis of the trunnion d and is provided at its outer end with the arm d, by which the sleeve d and pinion d may be turned to adjust the carriage d and the wrist-pin (I The bolt (Z extends beyond the end of the sleeve 01 and is screw-threaded. The nut d may be turned to draw the head of the bolt onto the carriage d and the carriage against the gear d to hold the carriage in the adjusted position. 1

The index-plate d" is secured by bolts 01 as shown in Fig. 3, so as to rotate with the trunnion d. A series of holes (Z placed at predetermined distances apart near the periphery of the plate, serve to indicate the movement of the arm (Z and the adjustment of the carriage (l and to secure the arm in the adjusted position the spring-pressed pin d enters one of the holes (1 The tightening up of the nut (1 may be used to secure the arm (Z by causing the nut to bear on the hub of the arm, as is shown in Fig. 2. By this construction the tool-slide is moved toward the work at slow speed, gradually diminishing as the tool acts on the work toward the end of the forward movement of the tool-slide and is withdrawn at a much higher speed as the wrist-pin (1 acts on the lever D during the return movement at points nearer the pivoted end of the lever than it does at the forward movement.

Power is imparted to the gear (Z by the shaft E, which is driven from the head-stock. The worm e on the shaft E engages with the worm-gear c. This gear is supported 011 a sleeve within which the shaft 2 is supported The pinion e is secured to the shaft (2 and engages with the gear (F, by which the mechanism for operating the tool-slide is operated.

Between the worm-gear e and the pinion e is connected a speed-changing mechanism controlled by a series of dogs 0%, adjustably secured to the disk 6", the shaft of which disk is driven from the shaft 6 so as to make one revolution during the series of reciprocations of the t0ol-slide required to perform the functions of all the tools used on one piece of work and to reproduce the same work on a series of pieces.

The particular construction of the speedchanging mechanism used forms no part of this present application. Said mechanism and the controlling means therefor are shown and claimed in our application, Serial No. 42,365, filed January 7, 1901, and the same are therefore not set forth in detail herein.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. The combination of a part to be moved, a lover, a wheel, a carriage slidably mounted on the wheel having a lever-engaging crankpin, a shaft, connections between the latter and the carriage for sliding the carriage, a bolt passing through said shaft, and means whereby the bolt clamps the carriage to the wheel.

2. The combination of a part to be moved, a lever for reciprocating the same, a wheel, a carriage slidably mounted on the wheel, a rack connected with the carriage, a pinion meshing with the rack, a sleeve extending axially through the wheel-hub on which the pinion is mounted, abolt passing through the pinion-sleeve and engaging the carriage, and a nut on the bolt to draw the bolt, to clamp the carriage against the wheel and the carriage against the pinion.

3. The combination of a part to be moved, a lever for reciprocating the same, a wheel having a lever-engaging crank-pin, a shaft, gearing actuated by the shaft to shift the position of the crank-pin, a handle on the shaft for turning it, and a clamping-bolt and nut for fixing the position of the crank-pin, the nut engaging the side of the shaft-handle to clamp it also.

In testimony whereof we have hereunto signed our names to this specification in the presence of two subscribing witnesses.

JAMES C. POTTER. JOHN JOHNSTON.

\Vitnesses:

B. M. SIMMs, J. A. MILLER, Jr. 

